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3 years ago

10

X+4y=8 2x-5y=29 Answer please

1 answer:

iogann1982 [59]3 years ago

7 0

$\left \{ {{x+4y=8\ \ | multiply\ by\ -2} \atop {2x-5y=29\ \ \ \ \ \ \ \ \ \ \ \ \ \ }} \right. \\\\ \left \{ {{-2x-8y=-16} \atop {2x-5y=29}} \right. \\+-----\\ add\ both\ equations\\\\
-13y=13\ \ \ | divide\ by \ -13\\\\
y=-1\\\\
x=8-4y=8-4(-1)=8+4=12\\\\
x=12$

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